11AA161-I/SN

Overview

The Microchip Technology 11AA161-I/SN is a 16 Kbit (2,048 x 8) serial electrically erasable programmable read-only memory (EEPROM). It utilizes the UNI/O single I/O interface with Manchester encoding on the SCIO pin. The device operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 100 kHz. It features industrial temperature ratings from -40°C to +85°C, housed in an 8-lead SOIC package.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding for combined clock and data transmission.
• Includes built-in write protection mechanisms such as power-on/off data protection circuitry and a write enable latch.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Provides block write protection allowing configuration to protect none, one-quarter, one-half, or all of the memory array.

Applications

• Interfacing with microcontrollers requiring low-pin-count non-volatile storage
• Embedded systems utilizing discrete I/O lines configured for UNI/O protocol
• ASIC applications needing reliable serial data retention

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the device address code corresponds to the '1' variant (0xA1) rather than the standard '0' variant. Ensure compatibility with the master controller's ability to generate the required standby pulses and start headers for the UNI/O protocol.

Selection Notes

Select this component when a single-wire interface is preferred over multi-wire buses like I2C or SPI. The 11AA161 differs from the 11AA160 by its hardwired device address code, enabling multiple devices on the same bus without conflict. Consider the 1.8V minimum operating voltage for low-power designs compared to the 2.5V requirement of the 11LC family.

Part Context

This part belongs to the 11AAXXX/11LCXXX family of 1 Kbit through 16 Kbit Serial EEPROMs. The 'AA' designation indicates support for low-voltage operation down to 1.8V, whereas the 'LC' series requires a minimum of 2.5V. The '1' in the model number specifies the unique device address code used for bus differentiation.

Replacement Considerations

The 11AA160-I/SN is a functional substitute with identical specifications except for the device address code (0xA0 vs 0xA1). The 11LC161-I/SN serves as a replacement if the system voltage does not drop below 2.5V, offering similar performance with a different address code.